I have sold a few things on eBay but it was too stressful. So mainly I just buy. I have never bought anything with a reserve because it says to me they want a certain amount that is probably beyond what I will want to pay since I am on the search for a bargain. I have bid .99 on lots of things and paid what I know was fair shipping.
It's pretty easy to tell who is making money on shipping.
I agree with those who say use a buy it now with free shipping.